Nematic Materials for Multiplex Addressing

Most of the compounds (96-105) collated in Table 3.9 exhibit a nematic phase as well as an unwanted smectic B phase. However, only the compounds linked directly, e.g. (96-99,102 and or linked by the 

Brackets represent an extrapolated transition temperature several ordered smectic phases present. 

Aromatic liquid crystals, such as compounds 106-109 collated in Table 3.10, have been investigated to a much lesser extent since they were perceived to be intrinsically more viscous than the analogous cyclohexane derivatives. This is indeed often the case. It was hoped that the incorporation of a fluorine atom in a lateral position of a polar compound, such as the ester (106), would create a nematic material, such as the esters (107 and 108), of positive dielectric anisotropy and low ratio of and Ae/sj.. Although this was partially 

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Figure 5.4 Twisted nematic materials for multiplex addressing.

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